package cn.thoughtworks.school.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;

public class IpUtil {
  public static String getIp(HttpServletRequest request) {
    String ip = request.getHeader("x-forwarded-for");
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("Proxy-Client-IP");
    }
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
      if(ip.equals("127.0.0.1")){
        InetAddress inet=null;
        try {
          inet = InetAddress.getLocalHost();
        } catch (Exception e) {
          e.printStackTrace();
        }
        ip= inet.getHostAddress();
      }
    }
    if(ip != null && ip.length() > 15){
      if(ip.indexOf(",")>0){
        ip = ip.substring(0,ip.indexOf(","));
      }
    }
    return ip;
  }
}
